Dev Turns MacBook Trackpad Into A Weighing Scale With A Free Open-Supply App

Right this moment, we begin the information with one thing fairly curious: Do you know that you need to use your MacBook trackpad as a scale? Nicely, that’s fairly spectacular, don’t you assume so? It’s all potential due to Krish Shah, a Canadian developer and blogger, who launched an experimental macOS utility known as TrackWeight. The app makes use of the strain sensitivity constructed into the MacBook’s trackpad to estimate weight and is now obtainable as open-source software program underneath the MIT License on GitHub.

TrackWeight works by deciphering strain knowledge captured by way of the Power Contact sensors. Nevertheless, it requires a steady finger contact throughout measurement to keep up the capacitive sensing needed for operation. Shah notes that whereas this design would possibly barely affect measurement accuracy, the outcomes have confirmed to be “fairly correct” in sensible use.

The app’s performance is supported by a mix of growth instruments, together with SwiftUI for the person interface and Mix for dealing with knowledge circulate. Shah additionally credit current work by developer Takuto Nakamura (@Kyome22) and the Open Multi-Contact Assist library, which permits entry to detailed trackpad contact metrics like place, strain, angle, and density.

I examined the accuracy by placing my MacBook on high of a weighing scale and recording a video whereas including strain, then evaluating frames.

You may see it’s fairly correct! pic.twitter.com/etP8qlrGCh

— Krish Shah (@KrishRShah) July 21, 2025

The app has limitations typical of experimental instruments. It’s most correct with objects weighing a number of tens of grams, and Shah has efficiently examined it with gadgets as heavy as 3.5 kilograms. Nevertheless, utilizing the app to weigh baggage or an individual is strongly discouraged because of the threat of damaging the laptop computer.

TrackWeight is solely appropriate with MacBook fashions that embrace Power Contact trackpads—particularly, MacBook Professional (2015 or newer) and MacBook (2016 or newer) fashions. Customers should guarantee the thing being weighed suits throughout the bodily dimensions of the trackpad. Moreover, metallic objects could trigger errors in studying resulting from false capacitive detection; Shah recommends putting such gadgets on a paper towel to keep away from misreadings.

Directions for constructing and operating the app can be found on the GitHub web page, however Shah emphasizes that TrackWeight is meant solely for academic and experimental use. It’s not really helpful for industrial functions or any context requiring exact or licensed measurements.

In essence, TrackWeight is a intelligent, low-stakes hack that demonstrates the artistic potential of Apple’s {hardware} — pushing the boundaries of what a laptop computer’s trackpad can do, whereas reminding customers to train warning when repurposing units in unintended methods.

Filed in Apple >Computers. Learn extra about Apple, Macbook Air and Macbook Pro.